Litter mates, right? Our boxer litter mates were never able to be out of their crates. We didn't even get crates until they were a year old and had chewed up a sofa, several sheets of drywall waiting for installation, pillows, the bottom edges of our kitchen cabinets, chewed through a sold wood door and halfway through a wall. Once we got crates, they settled right in, would be sleeping when we got home, and we were overjoyed. I could have probably left them out individually but not together. If one had a bad idea, they both participated, even if one was the main instigator. They always had to be crated when we were not home. Maybe when yours are a bit older but some dogs just can't be out and trusted.
My current dogs do not stay out together. Maybe when Lark is a bit older (she's 18 months old now). Chase can be out alone. Lark can be out alone, but they still rumble too much when they're together.